Fix microphone (Lenovo Ideapad 320) on Linux

In /usr/share/pulseaudio/alsa-mixer/paths/analog-input-internal-mic.conf and /usr/share/pulseaudio/alsa-mixer/paths/analog-input-mic.conf:

• Under [Element Internal Mic Boost] set volume to zero.
• Under [Element Int Mic Boost] set volume to zero.
• Under [Element Mic Boost] set volume to zero

Find your source name from the following command; mine is alsa_input.pci-0000_00_1f.3.analog-stereo:

pacmd list-sources | grep 'name:.*input'

Edit /etc/pulse/default.pa and add the following lines, where INPUT_NAME is name of the input source from above step:

load-module module-remap-source source_name=record_mono master=INPUT_NAME master_channel_map=front-left channel_map=mono
set-default-source record_mono

Then restart PulseAudio:

pulseaudio -k
pulseaudio --start

From: https://gist.github.com/Therises/d2e91c81af1574f9069635d520fdc7ec